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Analyze some Data

这项目被授予 mrbrave ,费用为$23 USD

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雇主工作
项目预算
$10 - $30 USD
全部竞标
18
项目描述

I have a list of customers for the year 2013, 2014, 2015. I want to exactly identify records of those customers whom we have lost i.e. customer records that are not appearing in the year 2015 - with a remark on each record which year we lost. Job requires triangulation of various unique fields, e.g. engine #, vehicle registration number, car make, customer name, Mobile Number etc. to pin point lost customers.

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